Why shouldn’t a 18th-level character be able to summon a Gargantuan monster? Or to become one…
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Giant Form III
School transmutation (polymorph); Level sorcerer/wizard 9
Casting Time 1 standard action
Components V, S, M (a piece of the creature whose form you plan to assume)
Range personal
Target you
Duration 1 min./level (D)
This spell functions as giant form I except that it also allows you to assume the form of any Gargantuan creature of the giant subtype (eclipse giant, mountain giant, rune giant, or vault giant). You gain the following abilities: +10 size bonus to Strength, -2 penalty to Dexterity, +8 size bonus to Constitution, +8 natural armor bonus, low-light vision, and a +20 foot enhancement bonus to your speed. If the form you assume has any of the following abilities, you gain the listed ability: air walk, swim 60 feet, darkvision 120 feet, scent, see in darkness, amphibious, frightful presence (60 ft., 1 round per 2 caster levels), rend (4d6 damage), regeneration 5, rock catching, and rock throwing (range 180 feet, 4d8 damage). If the creature has immunity or resistance to one element or effect, you gain that immunity or resistance.If the creature has vulnerability to an element, you gain that vulnerability.
Summon Giant Ally IV
School conjuration (summoning) [see text]; Level druid 9
Casting Time 1 standard action
Components V, S, F/DF (bit of cloth from a giant’s bag)
Range close (25 ft. + 5 ft./2 levels)
Effect one or more giants
Duration 1 round/level (D)
Saving Throw none; Spell Resistance no
This spell functions as summon giant ally I, except you can summon one ocean or storm giant; 1d3 ash or cloud giants; or 1d4+1 lower-level giants.